SERVICE TRAINING
Service Manual
6
Rock Valve
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Tapered bend
Cover bolts
Spacer
Keeper Bolt
Tension Nut w/Wrench flats
Wedge
6 inch clamp
Rotate the Cutting Ring 90˚ clockwise
Rotating The Cutting Ring
1. First, shut off the truck engine and put the
key in your pocket.
2. Remove the 6-inch clamp between the
tapered bend and the 6-inch elbow.
3. Remove the wedge from the tapered bend,
and pull the tapered bend away from the 6-
inch clamp.
4. Loosen the tension nut as explained previ-
ously.
5. Loosen the seven cover bolts two or three
full turns, but do not remove the bolts.
6. Push forward on the end of the rock valve
slewing cylinder. Because it has a single
pivot point, it will push the rock valve back-
wards toward the loosened cover. If you meet
resistance, do not force it. After you have
removed the hopper grate, you can gently
pry the rock valve backward from inside the
hopper.
7. Remove the hopper grate.
8. From inside the hopper, tap the cutting ring
forward, toward the spectacle plate. The ring
should pop loose. If it doesn’t, loosen the
cover bolts a little more, then gently pry the
rock valve rearward a little more until it
does. Rotate the ring 90
°
clockwise. (It
doesn’t really matter which way you rotate,
but to keep from forgetting which way you
went last time, Schwing recommends going
clockwise each time.)
9. Be sure that the ring is centered in the rock
valve. Tighten the cover bolts slightly, if
needed, to be sure that the ring isn’t cocked
one way or the other.
WARNING
Never rotate the cutting ring without
disabling the unit’s hydraulic system.
Amputation hazard!
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